As a first time upgrader I have some feedback on the whole process:
It would be good if the automatic updater checked that the database user has the right permissions before updating the database. In my case it didn't have the ALTER permission and so I got a few error messages. I didn't see an option to retry the database upgrade process after I had fixed the permission error but luckily I was able to use the pure SQL output from the error messages to redo the failed operations (through the mysql shell client).
I was trying to do the upgrade as quickly as possible so the forum wouldn't be unavailable to the users for long. The error message displayed on the site while I had the "install" folder in the root directly made me look very noobish, I wish it had just said that the forum was unavailable due to an upgrade being in process instead...
So as I was hurrying up with the upgrade I came to the part where it said some files had changed or was not the same or something strange and that I needed to download them for some reason. This was very confusing and it took me a while before I figured out what I had to do. Strange that the upgrade program didn't upload the files automatically through PHP uploading.
It would also have been great if the automatic updater could have downloaded the update file automatically through the web interface instead of me having to download and manually extract it to the root folder...
Hope any of these improvements can make it into a future realease